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参数资料
| 型号： | LTC4266IUHF#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PQCC38 |
| 封装： | 5 X 7 MM, LEAD FREE, PLASTIC, MO-220WHKD, QFN-38 |
| 文件页数： | 16/30页 |
| 文件大小： | 414K |
| 代理商： | LTC4266IUHF#PBF |
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LTC4266
4266fa
SERIALDIGITALINTERFACE
Overview
TheLTC4266communicateswiththehostusingastandard
SMBus/I2C2-wireinterface.TheLTC4266isaslave-only
device,andcommunicateswiththehostmasterusing
thestandardSMBusprotocols.Interruptsaresignaledto
thehostviatheINTpin.TheTimingDiagrams(Figures6
through10)showtypicalcommunicationwaveformsand
their timing relationships. More information about the
SMBusdataprotocolscanbefoundatwww.smbus.org.
TheLTC4266requiresboththeVDDandVEEsupplyrails
tobepresentfortheserialinterfacetofunction.
BusAddressing
TheLTC4266’sprimaryserialbusaddressis010xxxxb,with
thelowerfourbitssetbytheAD3-AD0pins;thisallowsup
to16LTC4266sonasinglebus.AllLTC4266salsorespond
totheaddress0110000b,allowingthehosttowritethe
samecommand(typicallyconfigurationcommands)to
multipleLTC4266sinasingletransaction.IftheLTC4266
isassertingtheINTpin,itwillalsorespondtothealert
responseaddress(0001100b)pertheSMBusspec.
InterruptsandSMBAlert
MostLTC4266porteventscanbeconfiguredtotrigger
aninterrupt,assertingtheINTpinandalertingthehost
totheevent.Thisremovestheneedforthehosttopoll
theLTC4266,minimizingserialbustrafficandconserving
hostCPUcycles.MultipleLTC4266scanshareacommon
INTline,withthehostusingtheSMBAlertprotocol(ARA)
todeterminewhichLTC4266causedaninterrupt.
RegisterDescription
Forinformationonserialbususageanddeviceconfigura-
tionandstatus,refertotheLTC4266SoftwareProgram-
mingdocumentation.
EXTERNALCOMPONENTSELECTION
PowerSuppliesandBypassing
TheLTC4266requirestwosupplyvoltagestooperate.VDD
requires3.3V(nominally)relativetoDGND.VEErequiresa
negativevoltageofbetween–44Vand–57VforType1PSEs,
or–50Vto–57VforType2PSEs,relativetoAGND.The
relationshipbetweenthetwogroundsisnotfixed;AGND
canbereferencedtoanylevelfromVDDtoDGND,although
itshouldtypicallybetiedtoeitherVDDorDGND.
VDDprovidespowerformostoftheinternalLTC4266cir-
cuitry,anddrawsamaximumof3mA.Aceramicdecoupling
capofatleast0.1μFshouldbeplacedfromVDDtoDGND,
ascloseaspracticaltoeachLTC4266chip.
Figure16showsathreecomponentlowdropoutregulator
foranegativesupplytoDGNDgeneratedfromthenegative
VEEsupply.VDDistiedtoAGNDandDGNDisnegative
referencedtoAGND.ThisregulatordrivesasingleLTC4266
device.InFigure17,DGNDistiedtoAGNDinthisboost
convertercircuitforapositiveVDDsupplyof3.3Vabove
AGND.ThiscircuitcandrivemultipleLTC4266devices
andoptocouplers.
ApplicAtions inForMAtion
4266 F16
R5
750k
D1
CMHZ4687-4.3V
C1
0.1F
Q2
CMPTA92
VEE
VDD
LTC4266
AGND
VEE
AGND
DGND
Figure16.NegativeLDOtoDGND
VEEisthemainsupplythatprovidespowertothePDs.
Becauseitsuppliesarelativelylargeamountofpowerand
issubjecttosignificantcurrenttransients,itrequiresmore
designcarethanasimplelogicsupply.ForminimumIR
lossandbestsystemefficiency,setVEEnearmaximum
amplitude(57V),leavingenoughmargintoaccountfor
transientover-orundershoot,temperaturedrift,andtheline
regulationspecsoftheparticularpowersupplyused.
BypasscapacitancebetweenAGNDandVEEisveryim-
portantforreliableoperation.Ifashortcircuitoccursat
oneoftheoutputportsitcantakeaslongas1μsforthe
LTC4266tobeginregulatingthecurrent.Duringthistime
thecurrentislimitedonlybythesmallimpedancesinthe
circuitandahighcurrentspiketypicallyoccurs,causinga
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